i use PC's all the time (on one now)
... i know all about right clicking
i mentioned the keyboard to point out that there's plenty of keys there that can be used to perform many actions that people use the mouse for
ctrl+c -> copy
ctrl+v -> paste
ctrl+x -> cut
ctrl+a -> select all
backspace -> go back in a browser
ctrl+t -> open a new tab in a browser
ctrl+w -> close current tab
and one of my favorites
ctrl+leftclick -> open link in new tab (can also be done by clicking a link w/ the scroll wheel)
there's so many more keyboard shortcuts that can be accomplished much more easily (and faster)
in any system you need to learn how it works
and humans are notoriously afraid of change ... they get set in their ways
the differences between windows and macOS for instance ... many people find it hard to adjust from one to the other
same with the differences between iOS and android (and for that matter between the different android UI flavors)
my point is that just because a system isn't immediately intuitive to you doesn't mean that the system is flawed
if you take the time to learn the system you might find out that it actually is intuitive, you were just used to a different system
and speaking of keyboards...
ever heard of the Dvorak Keyboard Layout?
http://en.wikipedia.org/wiki/Dvorak_Simplified_Keyboard
mental inertia is hard to overcome and is why we never made the switch away from QWERTY
even though QWERTY is bad for you (the details are in the wikipedia article - it's a pretty good read)
it's similar here with respect to mental inertia
you're used to something else so the new system doesn't feel right
...
now don't get me wrong, i'm not trying to say that CUE is perfect or that there are no problems with CUE
but technical issues aside, a lot of what I am seeing right now is growing pains as people learn and adapt to a new system of doing things